OpenCytoPreprocessing.r :
- changed the location, where the temporary ncdf files are written so that they don't get deleted if another process errors out
- changed when the 'lock' file is being deleted, so that the behavior is more robust

begin.html, OpenCyto.js, OpenCytoPreprocessing.js :
- added the LABKEY.ext.OpenCyto scoping namespace and changed the names of the methods accordingly

OpenCytoPreprocessing.js :
- eliminated the sessions management for both the 'Create' and 'Delete' UIs, so that a new session is created each time it is needed; the session also get deleted automatically as soon as it is done, that way we do not end up multiplying R sessions sitting in memory idle
- fixed, so that the console output is not displayed, if an info message shows up concerning another session already working on the same analysis folder
- filesIds string now is generated from a sorted array to prevent potential duplication of data